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A comprehensive set of 208 multiple-choice questions and answers covering various aspects of gas furnace installation, operation, and maintenance. It is designed to help hvac technicians prepare for certification exams or enhance their knowledge of gas furnace systems. The questions cover topics such as gas pressure, vent systems, ignition systems, safety procedures, and troubleshooting common furnace problems.
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A: 30.5 in. W.C. B: 60.5 in. W.C. C: 10.5 in. W.C. D: 13.5 in. W.C. ๐ธ๐ธ๐ธ : D: 13.5 in. W.C.
B: turn the thermostat off. C: turn the gas to the furnace off. D: All of the above. ๐ธ๐ธ๐ธ : D: All of the above.
B: one quarter inch C: one half inch D: one inch ๐ธ๐ธ๐ธ : D: one inch
A: controls manifold pressure. B: controls air to burner. C: controls gas to burner. D: controls vent fan cycling. ๐ธ๐ธ๐ธ : C
C: allow the heat exchanger to warm up. D: Both "A" and "C" ๐ธ๐ธ๐ธ : C
A: Fan on 125ยฐF / Fan off 110ยฐF / Limit cut out 200ยฐF. B: Fan on 125ยฐF / Fan off 80ยฐF / Limit cut out 200ยฐF. C: Fan on 95ยฐF / Fan off 110ยฐF / Limit cut out 250ยฐF. D: Fan on 95ยฐF / Fan off 80ยฐF / Limit cut out 250ยฐF ๐ธ๐ธ๐ธ : B
A: after an adjustable elbow. B: between flashing and the vent cap. C: above Type B metal vent. D: where it passes through a ceiling. ๐ธ๐ธ๐ธ : D
B: S connectors and drive clips. C: Snap connectors and expansion sleeves. D: Snap connectors and wedge sleeves. ๐ธ๐ธ๐ธ : B